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首页> 外文期刊>Journal of Materials Engineering and Performance >Extension of a Current Continuum-Level Material Model for Soil into the Low-Density Discrete-Particle Regime
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Extension of a Current Continuum-Level Material Model for Soil into the Low-Density Discrete-Particle Regime

机译：将土壤的当前连续体水平物质模型扩展到低密度离散颗粒体系中

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摘要

In this article, an attempt is made to construct a soil-material model which can be used over a wide range of soil densities. To construct such a model, an existing purely continuum-type soil material model (used in the high-density regime), within which the granular structure of the soil is neglected, is combined with an existing discrete-type soil material model (used in the low-density regime) within which soil is treated as an assembly of interacting particles. In order to enable it to be used in conventional transient, nonlinear dynamics, and finite element analyses, the new soil material model is cast using a continuum-type framework. Thus, while in the low-density regime soil behavior is fully dominated by the discrete-type soil-material model, soil has been treated as a continuum constituent properties of which are governed by particle geometrical parameters and particle-particle interaction laws. To demonstrate the utility and fidelity of the new soil material model, a series of uniaxial strain computational tests involving rectangular, parallelepiped-shaped soil-slug normal impact onto a rigid, fixed, flat surface is carried out. While these tests are of a one-dimensional character, they are generally considered as being representative of the loading and deformation histories experienced by mine-blast-ejected soil during its impact with the target structure. The results obtained using the newly proposed soil material model, in the low-density regime, are found to be fully consistent with their discrete-particle modeling and simulation counterparts, suggesting that the new model can be used in transient nonlinear dynamics, finite element simulations involving low-density soil.
机译：在本文中，尝试构建一种可在各种土壤密度上使用的土壤材料模型。为了构建这样的模型，将现有的纯连续介质型土壤材料模型（在高密度状态下使用）（其中忽略了土壤的颗粒结构）与现有离散型土壤材料模型（用于低密度状态），在该状态下，土壤被视为相互作用的粒子的集合。为了使其能够用于常规的瞬态，非线性动力学和有限元分析中，使用连续体框架来铸造新的土壤材料模型。因此，虽然在低密度状态下，土壤行为完全由离散类型的土壤-材料模型支配，但土壤已被视为连续体的组成特性，其特性受粒子几何参数和粒子-粒子相互作用定律支配。为了证明新的土壤材料模型的实用性和逼真度，进行了一系列单轴应变计算测试，涉及矩形，平行六面体形的土sl垂直撞击到刚性，固定，平坦的表面上。尽管这些测试具有一维特征，但通常被认为代表了由爆破喷出的土壤撞击目标结构时经历的载荷和变形历史。使用新提出的土壤材料模型在低密度条件下获得的结果与离散粒子模型和模拟对应物完全一致，这表明新模型可用于瞬态非线性动力学，有限元模拟涉及低密度土壤。

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